php文件锁定写入实例教程

<?php
function file_write($file_name, $text, $mode='a', $timeout=30){ 
    $handle = fopen($file_name, $mode); 
    while($timeout>0){ 
        if ( flock($handle, lock_ex) ) { 
            $timeout--; 
            sleep(1); 
        } 
    }  // www.jb200.com
    if ( $timeout > 0 ){ 
        fwrite($handle, $text.'n'); 
        flock($handle, lock_un); 
        fclose($handle); 
        return true; 
    } 
    return false; 
}